导入AFNetworking.h

pragma mark -- 检查网络状态

• (void)checkNetworking{
  // 1.创建对象
  AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];// 2.检查网络
  //设置网络状态发生改变触发的block
  [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus *status) {
  / *
  AFNetworkReachabilityStatusUnknown = -1, 未知AFNetworkReachabilityStatusNotReachable = 0, 不可用
  AFNetworkReachabilityStatusReachableViaWWAN = 1, 流量
  AFNetworkReachabilityStatusReachableViaWiFi = 2, wifi
  */
  NSArray *array = @[@"未知错误", @"无网络", @"使用流量", @"wifi环境"];
  UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"网络状态检查” message:array[status + 1] preferredStyle:UIAlertControllerStyleAlert];
  UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction
  *action) {
  [alert dismissViewControllerAnimated:YES completion:ni];
  }];
  [alert addAction:action];
  [self presentViewController:alert animated:YES completion:nil];
  }];
  // 开始检查
  [manager
  startMonitoring];// [manager stopMonitoring];
  }